Grand duke is a European hereditary title, used either by certain monarchs or by members of certain monarchs' families. In status, a grand duke traditionally ranks in order of precedence below an emperor, King, grand prince, archduke, or prince-archbishop, and above a sovereign prince or sovereign duke. The title is used in some current and former independent monarchies in Europe, particularly:in the present-day Grand Duchy of Luxembourg
historically by the sovereigns of former independent countries, such as Tuscany
in Baden, Hesse, Oldenburg, Mecklenburg-Schwerin, Mecklenburg-Strelitz and Saxe-Weimar – grand duchies from 1815 to 1918, and all now part of present-day Germany
formerly also in some countries in Northern Europe, such as the Grand Duchy of Finland or the Grand Duchy of Lithuania
1860 postage stamp of the Grand Duchy of Finland
Portrait of Grand Duchess Maria Fiodorovna by Heinrich von Angeli (1874) Saint Petersburg, Hermitage Museum
A monarch is a head of state for life or until abdication, and therefore the head of state of a monarchy. A monarch may exercise the highest authority and power in the state, or others may wield that power on behalf of the monarch. Usually a monarch either personally inherits the lawful right to exercise the state's sovereign rights or is selected by an established process from a family or cohort eligible to provide the nation's monarch. Alternatively, an individual may proclaim oneself monarch, which may be backed and legitimated through acclamation, right of conquest or a combination of means.
The Nine Sovereigns at Windsor for the funeral of King Edward VII, photographed on 20 May 1910. Standing, from left to right: King Haakon VII of Norway, Tsar (King) Ferdinand of the Bulgarians, King Manuel II of Portugal and the Algarve, Kaiser (Emperor) Wilhelm II of Germany, King George I of the Hellenes and King Albert I of the Belgians. Seated, from left to right: King Alfonso XIII of Spain, King George V of the United Kingdom and King Frederik VIII of Denmark.
Postcard from 1908 showing nineteen of the world's reigning monarchs: (left to right)King Rama V/Chulalongkorn of Siam (modern Thailand), King George I of Greece, King Peter I of Serbia, King Carol I of Romania, Emperor and King Franz Joseph of Austria-Hungary, Tzar (King) Ferdinand I of Bulgaria, Padishah (Emperor) Abdul Hamid II of the Ottoman Empire, King Victor Emmanuel III of Italy, Emperor Nicholas II of the Russia, King Edward VII of the United Kingdom,
Ramesses II (r. 1279–1213 BC), the third Pharaoh of the Nineteenth Dynasty of Egypt
Mohamoud Ali Shire, the 26th Sultan of the Somali Warsangali Sultanate